Publications
On the structure of Cohen-Macaulay simplicial affine semigroups. Comm. Algebra. 1999;27:511-518.Edit
On the structure of simplicial affine semigroups. Proc. Roy. Soc. Edinburgh Sect. A. 2000;130:1017-1028.Edit
Systems of inequalities and numerical semigroups. J. London Math. Soc. (2). 2002;65:611-623.Edit
Systems of proportionally modular Diophantine inequalities. Semigroup Forum. 2008;76:469-488.Edit